EP3663417B1 - Cooling apparatus for metal strip and continuous heat treatment facility for metal strip - Google Patents
Cooling apparatus for metal strip and continuous heat treatment facility for metal strip Download PDFInfo
- Publication number
- EP3663417B1 EP3663417B1 EP17932170.8A EP17932170A EP3663417B1 EP 3663417 B1 EP3663417 B1 EP 3663417B1 EP 17932170 A EP17932170 A EP 17932170A EP 3663417 B1 EP3663417 B1 EP 3663417B1
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- EP
- European Patent Office
- Prior art keywords
- nozzles
- strip
- metal strip
- width direction
- δxn
- Prior art date
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- 239000002184 metal Substances 0.000 title claims description 86
- 238000001816 cooling Methods 0.000 title claims description 47
- 238000010438 heat treatment Methods 0.000 title claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 238000009826 distribution Methods 0.000 description 34
- 229910000831 Steel Inorganic materials 0.000 description 27
- 239000010959 steel Substances 0.000 description 27
- 238000003491 array Methods 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000112 cooling gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5735—Details
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/007—Cooling of charges therein
- F27D2009/0072—Cooling of charges therein the cooling medium being a gas
- F27D2009/0075—Cooling of charges therein the cooling medium being a gas in direct contact with the charge
Definitions
- the present disclosure relates to a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip.
- Patent Document 1 discloses a gas jet cooling apparatus for cooling a steel strip by jetting a cooling gas to the steel strip from a plurality of nozzles attached to pressure headers facing both surfaces of the steel strip.
- this gas jet cooling apparatus multiple nozzles are arranged in a staggered manner on each side of the steel strip to form nozzle groups.
- the nozzles forming the nozzle groups on both sides of the steel strip are arranged such that the nozzles of the nozzle group on one of the front and back sides of the steel strip are offset from the nozzles of the nozzle group on the other of the front and back side of the steel strip in the longitudinal direction and in the width direction of the steel strip.
- Patent Document 1 JP4977878B
- the nozzle groups on the front and back sides of the steel strip are arranged to be offset in the longitudinal direction of the steel strip such that an offset amount is not less than 1/3 and not greater than 2/3 of the pitch of the nozzles in the longitudinal direction, and to be offset in the width direction of the steel strip such that an offset amount is not less than 1/6 and not greater than 1/3 of the pitch of the nozzles in the width direction to reduce vibration of the steel strip and reduce non-uniformity in the temperature distribution of the steel strip.
- an object of at least one embodiment of the present invention is to provide a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip whereby it is possible to equalize the temperature distribution of the metal strip after cooling.
- a gas jet cooling device with front-side and back-side nozzles with relative offsets in adjacent rows in the widthwise and longitudinal directions is disclosed in EP2 495 343 A1
- a cooling apparatus comprises a plurality of first nozzles and a plurality of second nozzles disposed on both sides of a metal strip in a strip thickness direction, respectively, across a pass line of the metal strip.
- the plurality of first nozzles and the plurality of second nozzles each form a staggered array having a pitch of Xn in a strip width direction of the metal strip, a pitch of Yn in a longitudinal direction of the metal strip, and a displacement amount of ⁇ Xn in the strip width direction between a pair of the first or second nozzles adjacent to each other in the longitudinal direction.
- the staggered array of the first nozzles and the staggered array of the second nozzles are offset from each other such that, a center of each second nozzle is positioned in a region defined by an ellipse having a center at a position offset by a shift amount S from a center of an adjacent first nozzle in the strip width direction and having a semi-axis of ⁇ Xn/4 in the strip width direction and a semi-axis of Yn/3 in the longitudinal direction.
- a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip whereby it is possible to equalize the temperature distribution of the metal strip after cooling.
- FIG. 1 is a schematic configuration diagram of a continuous heat treatment facility for a metal strip according to an embodiment.
- the continuous heat treatment facility 100 includes a furnace (not shown) for continuously performing heat treatment of a metal strip 2 (e.g., steel strip), rolls 6A, 6B for conveying the metal strip 2, and a cooling apparatus 1 for cooling the metal strip 2 heated by the furnace.
- the arrow in FIG. 1 represents the conveying direction (moving direction) of the metal strip 2.
- the roll 6A and roll 6B are disposed apart from each other in the vertical direction, and the metal strip 2 is conveyed between the roll 6A and roll 6B in the vertical direction (from bottom to top in the depicted example). Between the roll 6A and roll 6B, a pair of guide rolls 8A, 8B is disposed so as to sandwich the metal strip 2, which reduces bending and twisting of the metal strip 2.
- the cooling apparatus 1 includes a pair of jet units 10A, 10B disposed on both sides in the strip thickness direction of the metal strip 2 (hereinafter, also simply referred to as "strip thickness direction"), respectively, across a pass line 3 of the metal strip 2.
- the pair of jet units 10A, 10B is configured to jet a cooling gas toward the metal strip 2.
- the continuous heat treatment facility 100 may be a continuous annealing furnace for continuously annealing the metal strip 2 by cooling the metal strip 2 with the cooling apparatus 1 after heating the metal strip 2 by the above-described furnace.
- the cooling apparatus 1 according to some embodiments will now be described in more detail.
- FIG. 2 is a schematic diagram of the cooling apparatus 1 viewed in the strip thickness direction of the metal strip 2. More specifically, one of the pair of jet units 10A, 10b, namely the jet unit 10A, is viewed from the other, the jet unit 10B, in the strip thickness direction of the metal strip 2.
- the jet units 10A, 10B of the cooling apparatus 1 are disposed along the strip width direction of the metal strip 2 (hereinafter, also simply referred to as "strip width direction") on both sides of the metal strip 2 in the strip thickness direction across the pass line 3 of the metal strip 2.
- Each of the jet units 10A, 10B includes a header part 12 configured to be supplied with a high-pressure cooling gas, and a plurality of nozzles 14A, 14B disposed on the header part 12.
- the plurality of nozzles 14A, 14B includes a plurality of first nozzles disposed on the jet unit 10A and a plurality of second nozzles disposed on the jet unit 10B.
- the plurality of first nozzles 14A and the plurality of second nozzles 14B are disposed on both sides of the metal strip 2 in the strip thickness direction, respectively, across the pass line 3 of the metal strip 2.
- Each of the nozzles 14A, 14B communicates with the header part 12, and a high-pressure cooling gas supplied to the header part is jetted to one surface of the metal strip 2 through the nozzles 14A, while a high-pressure cooling gas supplied to the header part is jetted to the other surface of the metal strip 2 through the nozzles 14B.
- the header part 12 has a boxshape extending along the strip width direction, and multiple header parts 12 are arranged along the longitudinal direction of the metal strip 2 (conveying direction; also simply referred to as "longitudinal direction"). Further, as shown in FIG. 2 , the nozzles 14A, 14B are arranged along the strip width direction on each of the header parts 12 arranged along the longitudinal direction (conveying direction).
- the nozzles 14A, 14B arranged along the strip width direction on each of the header parts 12 arranged along the longitudinal direction form a staggered array, as described below.
- the staggered array of the plurality of nozzles 14A, 14B has the following feature.
- FIGs. 3 and 4 are each a schematic diagram of a part of the staggered arrays formed by the nozzles 14A, 14B.
- FIG. 4 is a partial enlarged view of the staggered arrays shown in FIG. 3 .
- FIGs. 3 and 4 shows the arrangement of nozzles 14A, 14B when the pluralities of nozzles 14A, 14B are viewed in the identical strip thickness direction, and the staggered array formed by the plurality of nozzles 14A and the staggered array formed by the plurality of nozzles 14B are superimposed.
- the nozzles 14A are represented by the solid line circle, while the nozzles 14B are represented by the dotted line circle.
- FIG. 3 not all the nozzles 14A, 14B included in the cooling apparatus 1 are shown, but a part of the nozzles 14A, 14B are shown within a range necessary for explaining the staggered arrays formed by the pluralities of nozzles 14A, 14B.
- the plurality of first nozzles 14A forms a staggered array having a pitch of Xn in the strip width direction of the metal strip 2, a pitch of Yn in the longitudinal direction of the metal strip 2, and a displacement amount of ⁇ Xn in the strip width direction between a pair of first nozzles 14A adjacent each other in the longitudinal direction.
- the plurality of second nozzles 14B likewise forms a staggered array as with the plurality of first nozzles 14A. Specifically, the plurality of second nozzles 14B forms a staggered array having a pitch of Xn in the strip width direction of the metal strip 2, a pitch of Yn in the longitudinal direction of the metal strip 2, and a displacement amount of ⁇ Xn in the strip width direction between a pair of second nozzles 14B adjacent each other in the longitudinal direction.
- the staggered array of the first nozzles 14A and the staggered array of the second nozzles 14B are offset from each other in the strip width direction and/or in the longitudinal direction.
- the staggered array of the first nozzles 14A and the staggered array of the second nozzles 14B are offset from each other such that, the center of the second nozzle 14B is positioned in a region (shown by the hatched area in FIG. 4 ) defined by an ellipse E1 having a center O 2 at a position offset by a shift amount S from the center O 1 of the first nozzle 14A in the strip width direction and having a semi-axis of ⁇ Xn/4 in the width direction and a semi-axis of Yn/3 in the longitudinal direction.
- ⁇ Xn/4 may be equal to Yn/3.
- the shift amount S is an index of offset in the strip width direction of the staggered arrays formed by the plurality of first nozzles 14A and the plurality of second nozzles 14B disposed on both sides of the metal strip 2 in the strip thickness direction.
- the shift amount S is closer to Xn/2, when viewed in a certain longitudinal position, a distance between nozzles including the first nozzles 14A and the second nozzles 14B aligned along the strip width direction is close to equidistance, and since the shift amount S is an odd multiple of ⁇ Xn/2, strip-widthwise positions of the first nozzles 14A and the second nozzles 14B arranged in the longitudinal direction do not overlap.
- a ratio ⁇ Xn/Xn of the displacement amount ⁇ Xn to the pitch Xn in the strip width direction is not less than 1/4 and not greater than 1/2.
- a ratio ⁇ Xn/Xn of the displacement amount ⁇ Xn to the pitch Xn in the strip width direction is not less than 1/3 and not greater than 1/4.
- the staggered array of each of the first nozzles 14A and the second nozzles 14B includes 10 or more nozzle rows each formed by a plurality of the first nozzles 14A or the second nozzles 14B aligned along the strip width direction.
- the temperature distribution of the metal strip 2 having passed through the first nozzles 14A and the second nozzles 14B is easily equalized, compared to a case where the number of nozzle rows forming the staggered array is smaller.
- the shift amount S may be not less than Xn/3 and not greater than Xn ⁇ 2/3.
- FIG. 11 is a schematic diagram of a part of the staggered arrays formed by the nozzles 14A, 14B according to an embodiment, and is a partial enlarged view similar to FIG. 4 .
- the staggered array formed by the first nozzles 14A and the staggered array formed by the second nozzles are offset from each other by a distance L in the longitudinal direction.
- L is a distance in the longitudinal direction between the center O 2 of the second nozzle 14B and the center O 1 of the first nozzle 14A.
- a relationship of 0 ⁇ L/Yn ⁇ 1/3 is satisfied where L is the distance in the longitudinal direction between the center O 2 of the second nozzle 14B and the center O 1 of the first nozzle 14A (see FIG. 11 ).
- the following conditions are used to calculate a temperature distribution in the strip width direction of a steel strip (metal strip) in each nozzle row position when the steel strip passes through the cooling apparatus 1 including the pluralities of first nozzles 14A and the second nozzles 14B forming staggered arrays in patterns 1 to 6 shown below.
- FIGs. 5 to 10 Calculation results of the temperature distributions in pattern 1 to 6 are shown in FIGs. 5 to 10 , respectively.
- the horizontal axis represents position in the strip width direction of the steel strip in the analysis area A1 (see FIG. 3 ), and the vertical axis represents temperature of the steel strip.
- T n means temperature at the time of passing through the nozzles in an n-row (n-stage).
- the patterns 1 to 3, 5, and 6 are examples of the present invention, while the pattern 4 is a comparative example where "m" is an even number.
- the reason may be that, in the patterns 1 to 3, since the shift amount S is closer to Xn/2, and the shift amount S is an odd multiple of ⁇ Xn/2, a distance between the nozzles including the first nozzles 14A and the second nozzles 14B aligned along the strip width direction is close to equidistance, and strip-widthwise positions of the first nozzles 14A and the second nozzles 14B arranged in the longitudinal direction do not overlap.
- the temperature distribution of the steel strip after passing through the nozzle rows is remarkably uniform. This indicates that the temperature distribution equalization effect is high when the ratio ⁇ Xn/Xn of the displacement amount ⁇ Xn to the pitch Xn in the strip width direction is 1/3 or 1/4.
- the temperature distribution of the metal strip 2 after passing through the first nozzles 14A and the second nozzles 14B is relatively equalized in any pattern.
- a pattern with a smaller L/Yn exhibits a higher equalization effect.
- the shift amount S is an index of offset in the strip width direction of the staggered arrays formed by the plurality of first nozzles and the plurality of second nozzles disposed on both sides of the metal strip in the strip thickness direction.
- a ratio ⁇ Xn/Xn of the displacement amount ⁇ Xn to the pitch Xn in the strip width direction is not less than 1/4 and not greater than 1/2.
- the ratio ⁇ Xn/Xn is 1/3 or 1/4.
- the staggered array of the first nozzles includes 10 or more nozzle rows each formed by a plurality of the first nozzles aligned along the strip width direction
- the staggered array of the second nozzles includes 10 or more nozzle rows each formed by a plurality of the second nozzles aligned along the strip width direction.
- the staggered arrays of the first nozzles and the second nozzles each include 10 or more nozzle rows, the temperature distribution of the metal strip 2 having passed through the first nozzles and the second nozzles is easily equalized, compared to a case where the number of nozzle rows forming the staggered array is smaller.
- the shift amount S is not less than Xn/3 and not greater than Xn ⁇ 2/3.
- a relationship of 0 ⁇ L/Yn ⁇ 1/3 is satisfied, where L is a distance in the longitudinal direction between the center O 2 of the second nozzle 14B and the center O 1 of the first nozzle 14A.
- a continuous heat treatment facility comprises: a furnace for performing heat treatment of a metal strip; and the cooling apparatus described in any one of the above (1) to (6) configured to cool the metal strip which has subjected to the heat treatment in the furnace.
- an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
- an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
- an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.
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- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
- The present disclosure relates to a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip.
- It is known in a continuous heat treatment facility for a metal plate in a strip form that the metal strip is cooled by jet (gas jet) of a cooling gas.
- For example,
Patent Document 1 discloses a gas jet cooling apparatus for cooling a steel strip by jetting a cooling gas to the steel strip from a plurality of nozzles attached to pressure headers facing both surfaces of the steel strip. In this gas jet cooling apparatus, multiple nozzles are arranged in a staggered manner on each side of the steel strip to form nozzle groups. The nozzles forming the nozzle groups on both sides of the steel strip are arranged such that the nozzles of the nozzle group on one of the front and back sides of the steel strip are offset from the nozzles of the nozzle group on the other of the front and back side of the steel strip in the longitudinal direction and in the width direction of the steel strip. - Patent Document 1:
JP4977878B - In the gas jet cooling apparatus disclosed in
Patent Document 1, as described above, the nozzle groups on the front and back sides of the steel strip are arranged to be offset in the longitudinal direction of the steel strip such that an offset amount is not less than 1/3 and not greater than 2/3 of the pitch of the nozzles in the longitudinal direction, and to be offset in the width direction of the steel strip such that an offset amount is not less than 1/6 and not greater than 1/3 of the pitch of the nozzles in the width direction to reduce vibration of the steel strip and reduce non-uniformity in the temperature distribution of the steel strip. - However, it is desired to further equalize the temperature distribution of a metal strip after cooling.
- In view of the above, an object of at least one embodiment of the present invention is to provide a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip whereby it is possible to equalize the temperature distribution of the metal strip after cooling.
- A gas jet cooling device with front-side and back-side nozzles with relative offsets in adjacent rows in the widthwise and longitudinal directions is disclosed in
EP2 495 343 A1 - A cooling apparatus according to at least one embodiment of the present invention comprises a plurality of first nozzles and a plurality of second nozzles disposed on both sides of a metal strip in a strip thickness direction, respectively, across a pass line of the metal strip. The plurality of first nozzles and the plurality of second nozzles each form a staggered array having a pitch of Xn in a strip width direction of the metal strip, a pitch of Yn in a longitudinal direction of the metal strip, and a displacement amount of ΔXn in the strip width direction between a pair of the first or second nozzles adjacent to each other in the longitudinal direction. The staggered array of the first nozzles and the staggered array of the second nozzles are offset from each other such that, a center of each second nozzle is positioned in a region defined by an ellipse having a center at a position offset by a shift amount S from a center of an adjacent first nozzle in the strip width direction and having a semi-axis of ΔXn/4 in the strip width direction and a semi-axis of Yn/3 in the longitudinal direction. The shift amount S is represented by S = m×ΔXn/2, where m is an odd number such that S is closest to Xn/2.
- According to at least one embodiment, there is provided a cooling apparatus for a metal strip and a continuous heat treatment facility for a metal strip whereby it is possible to equalize the temperature distribution of the metal strip after cooling.
-
-
FIG. 1 is a schematic configuration diagram of a continuous heat treatment facility for a metal strip according to an embodiment. -
FIG. 2 is a schematic diagram of a cooling apparatus according to an embodiment viewed in the strip thickness direction of a metal strip. -
FIG. 3 is a schematic diagram of a part of staggered arrays formed by nozzles according to an embodiment. -
FIG. 4 is a partial enlarged view of the staggered arrays shown inFIG. 3 . -
FIG. 5 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 6 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 7 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 8 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 9 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 10 is an example of calculation result of the temperature distribution during cooling of a steel strip. -
FIG. 11 is a schematic diagram of a part of staggered arrays formed by nozzles according to an embodiment. - Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is intended, however, that unless particularly identified, dimensions, materials, shapes, relative positions and the like of components described in the embodiments shall be interpreted as illustrative only and not intended to limit the scope of the present invention, as defined in the appended claims.
- First, with reference to
FIG. 1 , a continuous heat treatment facility for a metal strip to which acooling apparatus 1 according to some embodiments is applied will be described. -
FIG. 1 is a schematic configuration diagram of a continuous heat treatment facility for a metal strip according to an embodiment. As shown inFIG. 1 , the continuousheat treatment facility 100 includes a furnace (not shown) for continuously performing heat treatment of a metal strip 2 (e.g., steel strip),rolls metal strip 2, and acooling apparatus 1 for cooling themetal strip 2 heated by the furnace. The arrow inFIG. 1 represents the conveying direction (moving direction) of themetal strip 2. - As shown in
FIG. 1 , theroll 6A androll 6B are disposed apart from each other in the vertical direction, and themetal strip 2 is conveyed between theroll 6A and roll 6B in the vertical direction (from bottom to top in the depicted example). Between theroll 6A androll 6B, a pair ofguide rolls metal strip 2, which reduces bending and twisting of themetal strip 2. - The
cooling apparatus 1 includes a pair ofjet units pass line 3 of themetal strip 2. The pair ofjet units metal strip 2. - By jetting the cooling gas (e.g., air) to both surfaces of the
metal strip 2 from the pair ofjet units metal strip 2. - The continuous
heat treatment facility 100 may be a continuous annealing furnace for continuously annealing themetal strip 2 by cooling themetal strip 2 with thecooling apparatus 1 after heating themetal strip 2 by the above-described furnace. - The
cooling apparatus 1 according to some embodiments will now be described in more detail. -
FIG. 2 is a schematic diagram of thecooling apparatus 1 viewed in the strip thickness direction of themetal strip 2. More specifically, one of the pair ofjet units 10A, 10b, namely thejet unit 10A, is viewed from the other, thejet unit 10B, in the strip thickness direction of themetal strip 2. - As shown in
FIGs. 1 and2 , thejet units cooling apparatus 1 are disposed along the strip width direction of the metal strip 2 (hereinafter, also simply referred to as "strip width direction") on both sides of themetal strip 2 in the strip thickness direction across thepass line 3 of themetal strip 2. - Each of the
jet units header part 12 configured to be supplied with a high-pressure cooling gas, and a plurality ofnozzles header part 12. - The plurality of
nozzles jet unit 10A and a plurality of second nozzles disposed on thejet unit 10B. In other words, the plurality offirst nozzles 14A and the plurality ofsecond nozzles 14B are disposed on both sides of themetal strip 2 in the strip thickness direction, respectively, across thepass line 3 of themetal strip 2. - Each of the
nozzles header part 12, and a high-pressure cooling gas supplied to the header part is jetted to one surface of themetal strip 2 through thenozzles 14A, while a high-pressure cooling gas supplied to the header part is jetted to the other surface of themetal strip 2 through thenozzles 14B. - In the
cooling apparatus 1 shown inFIGs. 1 and2 , theheader part 12 has a boxshape extending along the strip width direction, andmultiple header parts 12 are arranged along the longitudinal direction of the metal strip 2 (conveying direction; also simply referred to as "longitudinal direction"). Further, as shown inFIG. 2 , thenozzles header parts 12 arranged along the longitudinal direction (conveying direction). - Thus, the
nozzles header parts 12 arranged along the longitudinal direction form a staggered array, as described below. - In some embodiments, the staggered array of the plurality of
nozzles -
FIGs. 3 and4 are each a schematic diagram of a part of the staggered arrays formed by thenozzles FIG. 4 is a partial enlarged view of the staggered arrays shown inFIG. 3 . -
FIGs. 3 and4 shows the arrangement ofnozzles nozzles nozzles 14A and the staggered array formed by the plurality ofnozzles 14B are superimposed. InFIGs. 3 and4 , thenozzles 14A are represented by the solid line circle, while thenozzles 14B are represented by the dotted line circle. - In
FIG. 3 , not all thenozzles cooling apparatus 1 are shown, but a part of thenozzles nozzles - As shown in
FIGs. 3 and4 , the plurality offirst nozzles 14A forms a staggered array having a pitch of Xn in the strip width direction of themetal strip 2, a pitch of Yn in the longitudinal direction of themetal strip 2, and a displacement amount of ΔXn in the strip width direction between a pair offirst nozzles 14A adjacent each other in the longitudinal direction. - The plurality of
second nozzles 14B likewise forms a staggered array as with the plurality offirst nozzles 14A. Specifically, the plurality ofsecond nozzles 14B forms a staggered array having a pitch of Xn in the strip width direction of themetal strip 2, a pitch of Yn in the longitudinal direction of themetal strip 2, and a displacement amount of ΔXn in the strip width direction between a pair ofsecond nozzles 14B adjacent each other in the longitudinal direction. - The staggered array of the
first nozzles 14A and the staggered array of thesecond nozzles 14B are offset from each other in the strip width direction and/or in the longitudinal direction. - More specifically, as shown in
FIG. 4 , the staggered array of thefirst nozzles 14A and the staggered array of thesecond nozzles 14B are offset from each other such that, the center of thesecond nozzle 14B is positioned in a region (shown by the hatched area inFIG. 4 ) defined by an ellipse E1 having a center O2 at a position offset by a shift amount S from the center O1 of thefirst nozzle 14A in the strip width direction and having a semi-axis of ΔXn/4 in the width direction and a semi-axis of Yn/3 in the longitudinal direction. - The shift amount S is represented by S = m×ΔXn/2, where m is an odd number such that S is closest to Xn/2.
- Depending on the combination of the displacement amount ΔXn and the pitch Yn in the longitudinal direction of the staggered arrays of the
first nozzles 14A and thesecond nozzles 14B, ΔXn/4 may be equal to Yn/3. In this case, the ellipse E1 having the semi-axis ΔXn/4 in the width direction and the semi-axis Yn/3 in the longitudinal direction is a circle having a radius of ΔXn/4(=Yn/3). - The shift amount S is an index of offset in the strip width direction of the staggered arrays formed by the plurality of
first nozzles 14A and the plurality ofsecond nozzles 14B disposed on both sides of themetal strip 2 in the strip thickness direction. - According to the above-described embodiment, since the shift amount S is closer to Xn/2, when viewed in a certain longitudinal position, a distance between nozzles including the
first nozzles 14A and thesecond nozzles 14B aligned along the strip width direction is close to equidistance, and since the shift amount S is an odd multiple of ΔXn/2, strip-widthwise positions of thefirst nozzles 14A and thesecond nozzles 14B arranged in the longitudinal direction do not overlap. Thus, according to the above-described embodiment, it is possible to effectively equalize the temperature distribution of themetal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B. - In some embodiments, a ratio ΔXn/Xn of the displacement amount ΔXn to the pitch Xn in the strip width direction is not less than 1/4 and not greater than 1/2.
- In this case, since the displacement amount in the strip width direction between two longitudinally adjacent nozzles is appropriate without being too small, it is possible to effectively equalize the temperature distribution of the
metal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B. - In some embodiments, a ratio ΔXn/Xn of the displacement amount ΔXn to the pitch Xn in the strip width direction is not less than 1/3 and not greater than 1/4.
- In this case, it is possible to effectively equalize the temperature distribution of the
metal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B. - In some embodiments, the staggered array of each of the
first nozzles 14A and thesecond nozzles 14B includes 10 or more nozzle rows each formed by a plurality of thefirst nozzles 14A or thesecond nozzles 14B aligned along the strip width direction. - In this case, the temperature distribution of the
metal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B is easily equalized, compared to a case where the number of nozzle rows forming the staggered array is smaller. - Depending on the nozzle arrangement manner, as the number of nozzle rows increases, periodicity (non-uniformity) of the temperature distribution in the strip width direction may become prominent. However, according to the above-described embodiment, even when the number of nozzle rows is 10 or more, the temperature distribution of the
metal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B is easily equalized. - In some embodiments, the shift amount S may be not less than Xn/3 and not greater than Xn×2/3.
-
FIG. 11 is a schematic diagram of a part of the staggered arrays formed by thenozzles FIG. 4 . - In the exemplary embodiment shown in
FIG. 11 , the staggered array formed by thefirst nozzles 14A and the staggered array formed by the second nozzles are offset from each other by a distance L in the longitudinal direction. In other words, L is a distance in the longitudinal direction between the center O2 of thesecond nozzle 14B and the center O1 of thefirst nozzle 14A. - In some embodiments, a relationship of 0 ≤ L/Yn ≤ 1/3 is satisfied where L is the distance in the longitudinal direction between the center O2 of the
second nozzle 14B and the center O1 of thefirst nozzle 14A (seeFIG. 11 ). - In this case, it is possible to effectively reduce non-uniform cooling of the
metal strip 2 in the longitudinal direction, and it is possible to effectively equalize the temperature distribution of themetal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B. - In the embodiment shown in
FIGs. 3 and4 , since the position of the center O2 of thesecond nozzle 14B in the longitudinal direction coincides with that of the center O1 of thefirst nozzle 14A, the distance L is zero. Accordingly, inFIGs. 3 and4 , the reference sign of the distance L is not shown. - The effect of equalizing the temperature distribution of the metal strip owing to the
cooling apparatus 1 according to the above-described embodiments is shown by simulation results. - The following conditions are used to calculate a temperature distribution in the strip width direction of a steel strip (metal strip) in each nozzle row position when the steel strip passes through the
cooling apparatus 1 including the pluralities offirst nozzles 14A and thesecond nozzles 14B forming staggered arrays inpatterns 1 to 6 shown below. - Length of steel strip in strip width direction to be calculated: Xn (the same length as pitch Xn of staggered array in strip width direction; see analysis area A1 shown in
FIG. 3 ) - Number of nozzle rows forming staggered array: 20 rows (20 stages)
- Parameters indicating features of staggered array in each pattern (Xn, Yn, ΔXn, S, L): see the following table
[Table 1] ΔXn/Xn S/Xn L/ Yn Pattern 1 1/2 1/4 or 3/4 0 Pattern 21/3 1/2(=3/6) 0 Pattern 31/4 3/8 or 3/5 0 Pattern 41/4 1/2 0 Pattern 51/3 1/2(=3/6) 1/3 Pattern 61/3 1/2(=3/6) 1/2 - Calculation results of the temperature distributions in
pattern 1 to 6 are shown inFIGs. 5 to 10 , respectively. In each graph ofFIGs. 5 to 10 , the horizontal axis represents position in the strip width direction of the steel strip in the analysis area A1 (seeFIG. 3 ), and the vertical axis represents temperature of the steel strip. Further, in each graph, To means initial temperature (temperature before passing through nozzles), and Tn means temperature at the time of passing through the nozzles in an n-row (n-stage). - The
patterns 1 to 3, 5, and 6 are examples of the present invention, while thepattern 4 is a comparative example where "m" is an even number. - Comparing the calculation results of the
patterns 1 to 3 and thepattern 4, as the number of nozzle rows through which the steel strip passes increases, in thepattern 4, the temperature distribution in the strip width direction becomes non-uniform and periodically increases and decreases, while in thepatterns 1 to 3 having the features of the present invention, the temperature distribution after cooling with the nozzles gradually becomes uniform. - The reason may be that, in the
patterns 1 to 3, since the shift amount S is closer to Xn/2, and the shift amount S is an odd multiple of ΔXn/2, a distance between the nozzles including thefirst nozzles 14A and thesecond nozzles 14B aligned along the strip width direction is close to equidistance, and strip-widthwise positions of thefirst nozzles 14A and thesecond nozzles 14B arranged in the longitudinal direction do not overlap. - In particular, in the
patterns - In this case, it is possible to effectively equalize the temperature distribution of the
metal strip 2 having passed through thefirst nozzles 14A and thesecond nozzles 14B. - Further, in the
patterns first nozzles 14A and thesecond nozzles 14B are the same, the displacement amounts between thefirst nozzle 14A and thesecond nozzle 14B in the longitudinal direction are different. - According to the calculation results of the
pattern metal strip 2 after passing through thefirst nozzles 14A and thesecond nozzles 14B is relatively equalized in any pattern. Among them, a pattern with a smaller L/Yn exhibits a higher equalization effect. In particular, this effect is higher in thepattern 2 satisfying L/Yn=0 (i.e., the position of the center O2 of thesecond nozzle 14B in the longitudinal direction coincides with that of the center O1 of thefirst nozzle 14A). - In the following, the outline of the cooling apparatus and the continuous heat treatment facility according to some embodiments will be described.
- (1) A cooling apparatus according to at least one embodiment of the present invention comprises a plurality of first nozzles and a plurality of second nozzles disposed on both sides of a metal strip in a strip thickness direction, respectively, across a pass line of the metal strip. The plurality of first nozzles forms a staggered array having a pitch of Xn in a strip width direction of the metal strip, a pitch of Yn in a longitudinal direction of the metal strip, and a displacement amount of ΔXn in the strip width direction between a pair of the first nozzles adjacent to each other in the longitudinal direction. The plurality of second nozzles forms a staggered array having a pitch of Xn in the strip width direction, a pitch of Yn in the longitudinal direction, and a displacement amount of ΔXn in the strip width direction between a pair of the second nozzles adjacent to each other in the longitudinal direction. The staggered array of the first nozzles and the staggered array of the second nozzles are offset from each other such that, a center of each second nozzle is positioned in a region defined by an ellipse having a center at a position offset by a shift amount S from a center of an adjacent first nozzle in the strip width direction and having a semi-axis of ΔXn/4 in the strip width direction and a semi-axis of Yn/3 in the longitudinal direction. The shift amount S is represented by S = m×ΔXn/2, where m is an odd number such that S is closest to Xn/2.
- The shift amount S is an index of offset in the strip width direction of the staggered arrays formed by the plurality of first nozzles and the plurality of second nozzles disposed on both sides of the metal strip in the strip thickness direction.
- With the above configuration (1), since the shift amount S is closer to Xn/2, when viewed in a certain longitudinal position, a distance between nozzles including the first nozzles and the second nozzles aligned along the strip width direction is close to equidistance, and since the shift amount S is an odd multiple of ΔXn/2, strip-widthwise positions of the first nozzles and the second nozzles arranged in the longitudinal direction are not likely to overlap. Thus, with the above configuration (1), it is possible to equalize the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles.
- (2) In some embodiments, in the above configuration (1), a ratio ΔXn/Xn of the displacement amount ΔXn to the pitch Xn in the strip width direction is not less than 1/4 and not greater than 1/2.
- With the above configuration (2), since ΔXn/Xn is not less than 1/4 and not greater than 1/2, so that the displacement amount in the strip width direction between two longitudinally adjacent nozzles is appropriate without being too small, it is possible to effectively equalize the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles.
- (3) In some embodiments, in the above configuration (2), the ratio ΔXn/Xn is 1/3 or 1/4.
- With the above configuration (3), since ΔXn/Xn is 1/3 or 1/4, it is possible to more effectively equalize the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles.
- (4) In some embodiments, in any one of the above configurations (1) to (3), the staggered array of the first nozzles includes 10 or more nozzle rows each formed by a plurality of the first nozzles aligned along the strip width direction, and the staggered array of the second nozzles includes 10 or more nozzle rows each formed by a plurality of the second nozzles aligned along the strip width direction.
- With the above configuration (4), since the staggered arrays of the first nozzles and the second nozzles each include 10 or more nozzle rows, the temperature distribution of the
metal strip 2 having passed through the first nozzles and the second nozzles is easily equalized, compared to a case where the number of nozzle rows forming the staggered array is smaller. - Depending on the nozzle arrangement manner, as the number of nozzle rows increases, periodicity (non-uniformity) of the temperature distribution in the strip width direction may become prominent. In this regard, with the above configuration (4), even when the number of nozzle rows is 10 or more, the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles is easily equalized.
- (5) In some embodiments, in any one of the above configurations (1) to (4), the shift amount S is not less than Xn/3 and not greater than Xn×2/3.
- (6) In some embodiments, in any one of the above configurations (1) to (5), a relationship of 0 ≤ L/Yn ≤ 1/3 is satisfied, where L is a distance in the longitudinal direction between the center O2 of the
second nozzle 14B and the center O1 of thefirst nozzle 14A. - With the above configuration (6), since the center of the second nozzle and the center of the first nozzle are at the same position in the longitudinal direction, it is possible to reduce non-uniform cooling of the metal strip in the longitudinal direction, and it is possible to effectively equalize the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles.
- (7) A continuous heat treatment facility according to at least one embodiment of the present invention comprises: a furnace for performing heat treatment of a metal strip; and the cooling apparatus described in any one of the above (1) to (6) configured to cool the metal strip which has subjected to the heat treatment in the furnace.
- With the above configuration (7), since the shift amount S is closer to Xn/2, when viewed in a certain longitudinal position, a distance between nozzles including the first nozzles and the second nozzles aligned along the strip width direction is close to equidistance, and since the shift amount S is an odd multiple of ΔXn/2, strip-widthwise positions of the first nozzles and the second nozzles arranged in the longitudinal direction do not overlap. Thus, with the above configuration (7), it is possible to equalize the temperature distribution of the metal strip having passed through the first nozzles and the second nozzles.
- Embodiments of the present invention were described in detail above, but the present invention is not limited thereto, and various amendments and modifications may be implemented within the scope of the invention, as defined in the appended claims.
- Further, in the present specification, an expression of relative or absolute arrangement such as "in a direction", "along a direction", "parallel", "orthogonal", "centered", "concentric" and "coaxial" shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
- For instance, an expression of an equal state such as "same" "equal" and "uniform" shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
- Further, for instance, an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.
- On the other hand, an expression such as "comprise", "include", "have", "contain" and "constitute" are not intended to be exclusive of other components.
-
- 1
- Cooling apparatus
- 2
- Metal strip
- 3
- Pass line
- 6A
- Roll
- 6B
- Roll
- 8A
- Guide roll
- 8B
- Guide roll
- 10A
- Jet unit
- 10B
- Jet unit
- 12
- Header part
- 14A
- First nozzle
- 14B
- Second nozzle
- 100
- Continuous heat treatment facility
- A1
- Analysis area
- O1
- Center of first nozzle
- O2
- Center of second nozzle
- S
- Shift amount
- Xn
- Pitch in strip width direction
- Yn
- Pitch in longitudinal direction
- ΔXn
- Displacement amount
Claims (7)
- A cooling apparatus for a metal strip, comprisinga plurality of first nozzles (14A) and a plurality of second nozzles (14B) disposed on both sides of a metal strip in a strip thickness direction, respectively, across a pass line of the metal strip,wherein the plurality of first nozzles (14A) forms a staggered array having a pitch of Xn in a strip width direction of the metal strip, a pitch of Yn in a longitudinal direction of the metal strip, and a displacement amount of ΔXn in the strip width direction between a pair of the first nozzles (14A) adjacent to each other in the longitudinal direction,wherein the plurality of second nozzles (14B) forms a staggered array having a pitch of Xn in the strip width direction, a pitch of Yn in the longitudinal direction, and a displacement amount of ΔXn in the strip width direction between a pair of the second nozzles (14B) adj acent to each other in the longitudinal direction,wherein the staggered array of the first nozzles (14A) and the staggered array of the second nozzles (14B) are offset from each other such that, a center of each second nozzle (14B) is positioned in a region defined by an ellipse having a center at a position offset by a shift amount S from a center of an adjacent first nozzle (14A) in the strip width direction and having a semi-axis of ΔXn/4 in the strip width direction and a semi-axis of Yn/3 in the longitudinal direction, andwherein the shift amount S is represented by S = m×ΔXn/2, where m is an odd number such that S is closest to Xn/2.
- The cooling apparatus according to claim 1,
wherein a ratio ΔXn/Xn of the displacement amount ΔXn to the pitch Xn in the strip width direction is not less than 1/4 and not greater than 1/2. - The cooling apparatus according to claim 2,
wherein the ratio ΔXn/Xn is 1/3 or 1/4. - The cooling apparatus according to any one of claims 1 to 3,wherein the staggered array of the first nozzles includes 10 or more nozzle rows each formed by a plurality of the first nozzles aligned along the strip width direction, andwherein the staggered array of the second nozzles includes 10 or more nozzle rows each formed by a plurality of the second nozzles aligned along the strip width direction.
- The cooling apparatus according to any one of claims 1 to 4,
wherein the shift amount S is not less than Xn/3 and not greater than Xn×2/3. - The cooling apparatus according to any one of claims 1 to 5,
wherein a relationship of 0 ≤ L/Yn ≤ 1/3 is satisfied, where L is a distance in the longitudinal direction between the center of the second nozzle and the center of the first nozzle. - A continuous heat treatment facility for a metal strip, comprising:a furnace for performing heat treatment of a metal strip; andthe cooling apparatus according to any one of claims 1 to 6 configured to cool the metal strip which has subjected to the heat treatment in the furnace.
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PCT/JP2017/041628 WO2019097713A1 (en) | 2017-11-20 | 2017-11-20 | Cooling device for metal plates and continuous heat treatment equipment for metal plates |
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EP3663417A4 EP3663417A4 (en) | 2020-08-12 |
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US (1) | US11286539B2 (en) |
EP (1) | EP3663417B1 (en) |
JP (1) | JP6886041B2 (en) |
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CN110892085B (en) | 2021-12-10 |
JP6886041B2 (en) | 2021-06-16 |
EP3663417A4 (en) | 2020-08-12 |
KR102382658B1 (en) | 2022-04-04 |
JPWO2019097713A1 (en) | 2020-09-03 |
CN110892085A (en) | 2020-03-17 |
EP3663417A1 (en) | 2020-06-10 |
KR20200014884A (en) | 2020-02-11 |
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US20200190622A1 (en) | 2020-06-18 |
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